Advanced rendering techniques allow you to render highly detailed and photorealistic images.
Ray tracing traces the path of rays sampled from the light source. Reflections and refractions generated this way are physically accurate.
Indirect illumination techniques, like global illumination and final gathering, enhance the realism of a scene by simulating radiosity, or the interreflection of light in a scene.
Final gathering is an optional, additional step used to improve global illumination (GI). It increases the number of rays used to calculate GI to smooth out and eliminate adverse lighting artifacts.